Well, I mean it's of course possible to find some cheaper parts, but the development costs are not related to this. How much time do you think it will last to draw all the boards and to write the code? Then build this all together and test it.You will probably need to build prototypes first and check that anything works.
And then you will find out that nobody needs it.This will be discouraging at least if not the ruin.
And then you will find out that nobody needs it.This will be discouraging at least if not the ruin.
And I to learn something new.So I have developed and build my own preamp to learn programming.This took some years but now I can program PIC micros in assembler.
So what fotios will do is not bad, but nothing new or special.There are already many similar DIY preamps.
Being an expert in assembly is wonderful for you!
You are a guru of assembler by sure!
Today, under the development of some powerful visual programming tools, everyone can become an expert in programming of microcontrollers in few months.
That is also wonderful for any electronic engineer or DIYer!
There is no need of use of this difficult in understanding RISC language. No need of use of assembler anymore.
The same applies and in analog electronics, with the use of SPICE simulators everyone could obtain complex and very effective audio circuits.
Top secrets in electronic circuits, locked program codes and a lot of other things are past anymore.
A sign of times!
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I wish it would be so, but unfortunately it's far from being like this.No compiler and no visual programming tool come close to assembler in efficiency and power.
So if you need a good program you need to learn assembler first.
The same applies to analog electronics, with the use of SPICE programs. They also are not very good and often give wrong results. At the end you need to build a prototype and check it with a scope to find problems.
So if you need a good program you need to learn assembler first.
The same applies to analog electronics, with the use of SPICE programs. They also are not very good and often give wrong results. At the end you need to build a prototype and check it with a scope to find problems.
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Dear Leon, no one talked for any novelty of this circuit. The only novelties are came from those wonderful new ICs of National Semiconductors and Texas - Burr Brown. These LME47910-20 have put new standards in audio electronics, have put in a new level operational amplifiers - i could not imagine this few years ago when the best audio IC was NE5532 - their performance in conjunction with this wonderful PGA2310 really shocked me!
There is also a hidden novelty. The digital control of this signal routing device - preamplifier. Implementation of digital displays, encoders, remote control etc managed by this wonderful new PIC18F45K22. And the upgradable program code, offered for free! Having as a precious assistant a visual programming interface - interpreter - simulator, we can do big upgrades in program code in just 1 day! No need of knowledge of a programming language, just need of logic thought and well focused demands. Just 2 years ago, we should pay enough money for the purchase of a digital control unit, that finally proved incomplete for our demands. Because its logic was based on the smattering logic - about audio - of each upstart programmer. Today we have - at last - two powerful weapons in our hands, visual programming and simulation.
There is people out there that helped me enough times, without money reward. The same i'd like to do for other people. Ancient Greek philosophers say that the knowledge is just an intelectual possession, is not commodity and should be shared for free.
Dear Leon
You can see that i really tried to be as polite as possible with you. That is my last reply to you. I have to mention that your replies are OUT OF TOPIC.
If you don't have to offer any constructive comment or instruction regarding this and only this project, please don't waste the precious space of this thread and my time to give you replies that also are OUT OF TOPIC.
Happy Easter!
I want help you to avoid problems that may emerge.That's all. Please understand me right. I'm not against your project, I simply tell you my experience.
You sound like a real expert. Please post some of your designs and software up so we can learn from you.
Hi Fotios
49xxx are very very good indeed. Great project BTW. Are you going to offer boards at some point?
Cheers
49xxx are very very good indeed. Great project BTW. Are you going to offer boards at some point?
Cheers
Fotios--
This is an excellent project. I am working on a preamp combining a JFET BOZ gain stage, B-1 buffer and Vicol's shunt volume controller. I have designed in an extra loop for my equalizer and am very pleased that your design has both a tape loop and a sound processor loop. I would be interested in boards if you go that route.
This is an excellent project. I am working on a preamp combining a JFET BOZ gain stage, B-1 buffer and Vicol's shunt volume controller. I have designed in an extra loop for my equalizer and am very pleased that your design has both a tape loop and a sound processor loop. I would be interested in boards if you go that route.
Stolen Schematic
Yes, anything you need - even if it was stolen (I was not asked, and gave no permission) from my website. The preamp circuit shown towards the bottom of the page was stolen from my website - see Project 97 for the original. It's really easy to see that Leon08 stole it, because the defeat switch arrangement is unique.
The ESP logo and other identification has been removed, but all component designators are the same, and it's a cut-down version of my circuit.
Shame, Leon08, shame !
Well, here is mylink deleted by moderationhttp://www.freewebs.com/eduard7/index.htm website.There you can find anything what you need.
Yes, anything you need - even if it was stolen (I was not asked, and gave no permission) from my website. The preamp circuit shown towards the bottom of the page was stolen from my website - see Project 97 for the original. It's really easy to see that Leon08 stole it, because the defeat switch arrangement is unique.
The ESP logo and other identification has been removed, but all component designators are the same, and it's a cut-down version of my circuit.
Shame, Leon08, shame !
Hi Fotios
Just a quick question, would your PIC and s/w be capable of driving three daisy chained PGA chips? I'm looking for a 6ch volume control for a DCX crossover. I can design the rest of the circuitry and PCB, but as a non-programmer, it would be useful if I could use your expertise to bypass that stage of the process. 🙂
Just a quick question, would your PIC and s/w be capable of driving three daisy chained PGA chips? I'm looking for a 6ch volume control for a DCX crossover. I can design the rest of the circuitry and PCB, but as a non-programmer, it would be useful if I could use your expertise to bypass that stage of the process. 🙂
Hi Al
Yes, it is enough easy to do this. I can suppose that x-over will be 3 way stereo (6 channel total). So, e.g. both L & R MID outputs will have same level. The same LOW and HIGH outputs.
Yes, 3 PGA2310 in daisy configuration are perfect for this.
Tell me if you like a LCD display, also if you like the unit to be remotely controllable.
It's for a particular implementation of the DCX. What I have currently is an AV preamp that feeds the analogue inputs of the DCX, (not great gain structure for music but fine for movies and TV) and what I would like to do is use the SPDIF input on the DCX fed from a music server with a separate volume control. I'll use the input switching toggle on the DCX to drive relays so in AV mode the PGAs are bypassed, but in music mode the volume control is inline. That way I can just store two identical, ( or different! 🙂 ) programs in the crossover and not worry about setting output levels on the new volume control every time I want to use the system in AV mode.
Remote control would be nice, but I'm not too fussed about a LCD or even balance controls, as long as the PGAs all clock up and down at the same rate that will do the job adequately.
I suppose in an ideal world each channel would have programmable offsets for balancing outputs to differing sensitivity drivers so you can bypass the digital attenuation in the DCX, but I could live without that. I basically just want something cheap and simple that'll fit in a small external case, or even internally in my modded DCX.
Remote control would be nice, but I'm not too fussed about a LCD or even balance controls, as long as the PGAs all clock up and down at the same rate that will do the job adequately.
I suppose in an ideal world each channel would have programmable offsets for balancing outputs to differing sensitivity drivers so you can bypass the digital attenuation in the DCX, but I could live without that. I basically just want something cheap and simple that'll fit in a small external case, or even internally in my modded DCX.
Attachments
Great stuff Fotios (as always) - thanks for sharing and inspiring others to learn and build.
Cheers!
Cheers!
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